exact searches

Is there a way to search a ferret index and have it only display exact
matches?

I read in other posts that you should have an untokenized field for the
exact matches, but I also use the same field for doing unexact matches
too (with the stemming analyzer).  Would I need a copy of this field in
the index untokenized to do an exact match or is there any sort of flag
or something I could pass to make it only match exactly when i want to
do an exact search?

Thanks,
Ray

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